The blend is based on the original Don Carlos cigar (which was released in 1976) but has been slightly modified for this particular version. If you want to know exactly what makes the Eye of the Bull different from the regular Don Carlos line, you'll have to use your imagination. The Fuentes are very careful about the details of the mix. The wrapper comes from Cameroon and the deposit from the Dominican Republic, which is the basic recipe for most Don Carlos cigars.